PJB-2019-762
Effects of nitrogen and phosphorus rates on determinants of yield in oilseed flax
Yaping Xie
Abstract
Oilseed flax (Linum usitatissimum L.) growth and productivity are influenced by many factors such as agronomic practices and environments. This field study was conducted to investigate the effects of nitrogen (N) combined with phosphorus (P) supplies on traits and yields of oilseed flax in northwest China. To this end, the seed yield, biomass yield, harvest index (HI), yield components, and oil content were quantified. Also, the effects of biomass yield and HI on the seed yield as well as the contribution of oil content and seed yield to the oil yield were examined. The cultivar “Longya 1” was planted for 3-yr. Treatments were performed by using three rates of N supply (0, 75, and 150 kg N/ha) combined with three rates of P supply (0, 33, and 66 kg P/ha). Most of the traits increased to a greater extent by N supply as compared to those obtained by P supply. Nitrogen supply increased the seed yield by an average of 28% above the zero-N and P supply increased by 22% compared to the zero-P across 3-yr. Among yield components, the capsules/plant was most significantly affected by N and P supply. The results indicated that the contribution of biomass and HI to the seed yield was dominated by N supply and environment. The findings suggested that the appropriate N and P rates based on specific environment can promote the growth, improve the growth rates, and increase productivity of oilseed flax.
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